Make the SILOptimizer/swap_refcnt.swift test more resilient

Author: gribozavr

test/SILOptimizer/swap_refcnt.swift

@@ -2,10 +2,10 @@
 
 // Make sure we can swap two values in an array without retaining anything.
 
-//CHECK-LABEL: _TF11swap_refcnt11swapByIndex
-//CHECK-NOT: strong_retain
-//CHECK-NOT: strong_release
-//CHECK: return
+// CHECK-LABEL: sil @_TF11swap_refcnt11swapByIndex
+// CHECK-NOT: strong_retain
+// CHECK-NOT: strong_release
+// CHECK: return
 public func swapByIndex(A: inout [Int8], x : Int, y : Int) {
   swap(&A[x],&A[y])
 }